Disney Publishing launched the free app this week for iPhone and iPad. From it, kids can watch clips of the classic show, play games, read about how to conduct offline experiments and tap a virtual Bill Nye bobble-head for random science facts.

Though the app is free, it includes opportunities to upgrade, such as buying full episodes of Nye’s show. Adding micro-transactions to free apps is a monetization strategy that Disney (and most other app makers) also use in mobile games like Where’s My Water?. Disney's head of games, John Pleasants, told Fast Company in a recent interview that it's "where everything is going."

But that doesn't mean there's not good stuff in the free version. One hidden gem in the Bill Nye The Science Guy app that might hit closer to parent’s nostalgia than children’s interests: A bow-tie tying tutorial narrated by Nye.